Sprintstack is an Android studio based in Slough. We ship Kotlin apps for game studios, product teams, and founders who need to move. Two-week rhythm, weekly signed builds, Play Store on the day we said we would.
Six shapes of engagement. Fixed-price where we can; time-and-materials where fixed doesn't make sense. Always your call which.
Brief through to Play Store live. 8-16 weeks depending on scope. Kotlin native, Compose UI, backend integration, release pipeline, first-month post-launch cover.
One substantial feature added to your existing Android app in four weeks. Fixed price, fixed scope, merged clean into your release rhythm.
Two-week deep dive on your Android app. Performance, crash rate, gradle setup, dependency graph, release process. Written report; 60-min walkthrough with your team.
Inherited an Android codebase that nobody wants to touch? We triage the emergencies, stabilise the pipeline, plan the rewrite in phases you can commit to.
Store listing, metadata, screenshots, video, staged rollout, 90-day ASO. Runs alongside a build or as a standalone project for teams launching internally-built apps.
Ongoing engineering time on your Android app after launch. Predictable monthly capacity, cancel any month with 30 days notice, no minimum term.
Same rhythm on every engagement. Weekly signed build. Friday demo. Monthly retro that names what didn't work.
We read what you have, interview 3-5 stakeholders, and write a plan that includes what we're deliberately not doing. Signed off before we write a line of Kotlin.
Two-week sprints from here on. Weekly signed APK on your team's phones. Friday demo at a standing time. Written recap in Slack same day.
Play Store submission with proper metadata, staged rollout (5% → 20% → 100% over 8 days), crash monitoring, first-week fire response by our on-call.
Codebase readme, release runbook, three-day pairing session with your engineers, first-month retainer at half rate. Then you run it.
Added the Android-side leaderboards and cloud saves for an indie roguelike. Four-week sprint alongside the studio's release schedule. 62% of active players opted into cloud save in the first month.
Ported an indie narrative game from a bespoke engine to native Android. 12-week build, Play Store live in Q1 2026, 4.8★ average across 2,400 reviews.
Rescued a companion Android app that had 8% crash rate and no working release pipeline. Six-month engagement: crash rate to 0.3%, pipeline rebuilt, handed back to their team.
Ongoing engineering retainer covering seven Android games across a publisher's portfolio. Monthly capacity of 60 engineer-hours; used flexibly across their titles.
Book a 30-minute intro. Tell us the shape. If it's a fit we'll write a phase-1 proposal inside a week.